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From: Thierry Banel <tbanelwebmin@free.fr>
To: emacs-orgmode@gnu.org
Subject: Re: babel C, C++, D enhancement
Date: Tue, 17 Jun 2014 22:51:04 +0200	[thread overview]
Message-ID: <53A0AA38.4010100@free.fr> (raw)
In-Reply-To: <87k38f78yx.fsf@Rainer.invalid>

Le 17/06/2014 19:16, Achim Gratz a écrit :
> Thierry Banel writes:
>> You are right, INT_MAX is the C++ constant to compare to.
>> It is defined in limits.h
>>
>> I'm not sure I want to locate limits.h (where is it ? are there several
>> versions ?),
>> and parse it, all from within Emacs-lisp...
> No, this isn't something you should even try.  The only method that is
> known to work is what autoconf does: compile a program and check the
> output.
Absolutely right.
Or use "getconf INT_MAX" as suggested by Nick Dokos, but this does not
works everywhere.
>> And this will have to be done for all languages (Python, Perl, Java,
>> and so on), not just C++.
> Let's stick with C(++) and solve that problem first, that there is a lot
> of boilerplate code in Babel language support that should be lifted off
> elsewhere is a discussion for another time.
I do agree.

By the way, other languages may not be as tricky.

- Java specifies int to be exactly 32 bits, long to be 64 bits.
  http://en.wikibooks.org/wiki/Java_Programming/Primitive_Types

- Same goes for D.
  http://dlang.org/type.html

- In C++ there is a new specification with types like:
  |int_least32_t| // at least 32 bits
  |int32_t // exactly 32 bits|
  http://en.cppreference.com/w/cpp/types/integer

>> Or we could assume that INT_MAX is always 2147483647.
>> (Which of course is not true).
> You've just made compilers customizable.  For a start, make those
> constants customizable per compiler as well?
>
Thomas S. Dye suggested just that.
Should we throw this detail at the user ?
She will have a hard time figuring out why we bother her with integer size.


Regards
Thierry

  reply	other threads:[~2014-06-17 20:51 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-11  1:34 Patch for testing `org-open-at-point' York Zhao
2014-04-11  7:23 ` Nicolas Goaziou
2014-04-11 10:25 ` Bastien
2014-04-12 14:22   ` York Zhao
2014-04-17 18:48     ` Bastien
2014-04-20 19:19       ` Michael Strey
2014-04-20 19:56       ` York Zhao
2014-06-01  1:12         ` York Zhao
2014-06-01  8:53           ` Bastien
2014-06-01 20:15           ` Achim Gratz
2014-06-01 21:14             ` Bastien
2014-06-01 21:58               ` babel C, C++, D enhancement Thierry Banel
2014-06-06 16:31                 ` Eric Schulte
2014-06-07 18:19                   ` Thierry Banel
2014-06-08 20:19                   ` Thierry Banel
2014-06-08 23:22                     ` Eric Schulte
2014-06-09  9:40                       ` Thierry Banel
2014-06-13  6:51                       ` Achim Gratz
2014-06-13 11:47                         ` Eric Schulte
2014-06-13 22:07                         ` Thierry Banel
2014-06-16 18:28                           ` Achim Gratz
2014-06-16 20:49                             ` Thierry Banel
2014-06-16 21:14                               ` Thomas S. Dye
2014-06-16 22:24                                 ` Nick Dokos
2014-06-17 17:16                               ` Achim Gratz
2014-06-17 20:51                                 ` Thierry Banel [this message]
2014-06-13 10:55                       ` Bastien
2014-06-13 11:58                         ` conforming commit messages Was: " Eric Schulte
2014-06-13 14:50                         ` Eric Abrahamsen
2014-06-02 19:13               ` Patch for testing `org-open-at-point' Achim Gratz
2014-06-03  7:22                 ` Bastien

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